Net efficiency of roller skiing with a diagonal stride
Deutscher übersetzter Titel: | Netto-Wirkungsgrad von Rollskiern mit einem alternierenden Schritt |
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Autor: | Nakai, Akira; Ito, Akira |
Erschienen in: | Journal of sports sciences |
Veröffentlicht: | 29 (2011), 4, S. 423-429, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0264-0414, 1466-447X |
DOI: | 10.1080/02640414.2010.543913 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201403003294 |
Quelle: | BISp |
Abstract
The aims of this study were: (a) to determine net efficiency during roller skiing with a diagonal stride at various speeds; (b) to assess the development of net efficiency across speeds; and (c) to examine the characteristics of efficiency in diagonal roller skiing. Two-dimensional kinematics and oxygen uptake were determined in eight male collegiate cross-country ski athletes who roller skied with the diagonal stride at various speeds on a level track. Net efficiency was calculated from rates of internal and external work and net energy expenditure. Individual net efficiency ranged from 17.7% to 52.1%. Net efficiency in the entire group of athletes increased with increasing speed, reached a maximum value of 37.3% at 3.68 m * s-1, before slowly decreasing. These findings indicate that roller skiing with the diagonal stride at high speed is a highly efficient movement and that an optimal speed exists at which net efficiency can be maximally enhanced in diagonal roller skiing. Verf.-Referat